1 files changed, 27 insertions, 0 deletions

diff --git a/js/lib/geom/shape-primitive.js b/js/lib/geom/shape-primitive.js
index 97873d32..9864a8e9 100644
--- a/js/lib/geom/shape-primitive.js
+++ b/js/lib/geom/shape-primitive.js
@@ -49,6 +49,33 @@ ShapePrimitive.create = function(coords,  normals,  uvs,  indices, primType, ver
         return prim;
 };
 
+ShapePrimitive.getBounds = function( prim )
+{
+        var verts = prim.bufferStreams[0];
+        var nVerts = verts.length;
+        var xMin = verts[0],  xMax = verts[0],
+                yMin = verts[1],  yMax = verts[1],
+                zMin = verts[2],  zMax = verts[2];
+
+        for (var index=3;  index<verts.length;  )
+        {
+                if (verts[index] < xMin)  xMin = verts[index];
+                else if (verts[index] > xMax)  xMax = verts[index];
+
+                index++;
+                if (verts[index] < yMin)  yMin = verts[index];
+                else if (verts[index] > yMax)  yMax = verts[index];
+
+                index++;
+                if (verts[index] < zMin)  zMin = verts[index];
+                else if (verts[index] > zMax)  zMax = verts[index];
+
+                index++;
+        }
+
+        return [xMin, yMin, zMin,  xMax, yMax, zMax];
+};
+
 if (typeof exports === "object") {
     exports.ShapePrimitive = ShapePrimitive;
 }
\ No newline at end of file